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Remagnetization of the Coast Range ophiolite at Stanley Mountain, California, during accretion near 10??N paleolatitude

Geology

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Abstract

Paleomagnetic data are presented for a 50-m-thick sequence of Oxfordian to Tithonian sedimentary rocks conformably overlying Upper Jurassic pillow basalt. These new data are similar in direction and polarity to previously published paleomagnetic data for the pillow basalt. The Jurassic sedimentary rocks were deposited during a mixed-polarity interval of the geomagnetic field, and uniformity of the remanent magnetization within the entire section of pillow basalt and sedimentary rocks indicates later remagnetization. Remagnetization is interpreted to have occurred during accretion to the continental margin. Similar paleolatitudes calculated for the ophiolite (11?? ?? 3??) and for mid-Cretaceous sedimentary rocks of the Stanley Mountain terrane at Figueroa Mountains (6?? ?? 5??) are consistent with remagnetization of the ophiolite at low paleolatitudes. Comparison with uniform-polarity directions for other remnants of ophiolite in southern California and elsewhere along the Pacific coast suggests that the Coast Range ophiolite at Stanley Mountain has been remagnetized along the North American margin near 10??N paleolatitude between earliest and mid-Cretaceous time and subsequently transported northward by strike-slip faulting related to relative motions between the Farallon, Kula, Pacific, and North American plates. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Remagnetization of the Coast Range ophiolite at Stanley Mountain, California, during accretion near 10??N paleolatitude
Series title:
Geology
Volume
20
Issue:
6
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
503
Last page:
506